EP1454757B1 - Medium transporting device and recording apparatus - Google Patents
Medium transporting device and recording apparatus Download PDFInfo
- Publication number
- EP1454757B1 EP1454757B1 EP04005299A EP04005299A EP1454757B1 EP 1454757 B1 EP1454757 B1 EP 1454757B1 EP 04005299 A EP04005299 A EP 04005299A EP 04005299 A EP04005299 A EP 04005299A EP 1454757 B1 EP1454757 B1 EP 1454757B1
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- European Patent Office
- Prior art keywords
- medium
- recording medium
- suction
- transporting
- suction holes
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005192 partition Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 9
- 230000032258 transport Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0085—Using suction for maintaining printing material flat
Definitions
- the present invention relates to a medium transporting device which transports a medium and a recording apparatus provided with this medium transporting device.
- an ink jet printer that is one of recording apparatuses
- paper that is one of recording media is being fed into a recording section by a paper transporting device
- recording is performed and thereafter the paper is fed out to the outside.
- the ink jet printer while the paper is fed in a state where it is held between a feed roller and its driven roller, recording is performed in a recording head, and thereafter the paper is fed out in a state where it is held by a discharge roller and a spur roller functioning as its driver roller, and discharged.
- the paper transporting device in case that an image composed of ejected many ink droplets, for example, a solid image is recorded on the paper, the paper absorbs a large amount of ink, so that it bulges toward the recording head in the wavy shape after recording, that is, cockling is produced. As this cockling develops, the distance between the paper and the recording head becomes more uneven, and unevenness is produced in ink splash distance, whereby unevenness is produced in recording, or the paper comes into contact with the recording head and stains.
- an ink jet printer in which plural openings are formed on a paper transporting surface in the paper transporting direction and in the direction perpendicular to the paper transporting direction at a regular pitch, that is, the plural openings are provided in the shape of a grid, and the paper is sucked through these opening by a suction pump thereby to suppress the above cockling (refer to JP-A-63-303781 and JP-A-3-270 ).
- a curve is produced in paper by the influence of environment such as humidity and temperature, or by properties of surface coat material. Particularly, it is most difficult to suck and attract ends (a leading end and both side ends) of the paper which has curled upward. Therefore, there is fear that the ends of the paper which has curled are stained by contact with the recording head.
- ink jet printers including the above conventional suction type paper transporting device
- the dimples are formed in the shape of a grid correspondingly to each opening, both ends of the paper in a direction perpendicular to the paper transporting direction, that is, both side ends of the paper get an partition walls formed outside the dimples corresponding to the both side ends of the paper. Therefore, the both side ends of the paper readily curl up by the suction force of holes in the dimples corresponding to the both side ends, and there is fear that the both side ends are stained by contact with the recording head.
- US 2002/0167578 discloses an image forming apparatus having a paper support unit where the paper support unit has a plurality of suction holes. This document forms the basis for the preamble portion of claim 1.
- An object of the invention is to prevent curling-up and coming-up of the ends of the medium when the medium is transported.
- a medium transporting device comprising: a medium transporting surface having a plurality of suction holes an which a supplied medium is transported; characterized in that the area of each of the suction holes formed in positions at which both side ends of said medium are transported is set larger than that of other suction holes.
- a medium transporting device is characterized in that an area ratio of said suction hole having a larger area with respect to said suction hole having a smaller area is 2 to 6.5.
- an area ratio of said suction hole having a larger area with respect to said suction hole having a smaller area is 2 to 6.5.
- a medium transporting device is characterized in that said positions on the medium transporting surface are formed in a plural number correspondingly to predetermined sizes of said medium.
- said positions on the medium transporting surface are formed in a plural number correspondingly to predetermined sizes of said medium.
- a liquid jet apparatus is characterized by including the medium transporting device according to the invention, wherein the medium transporting device is a jetted material transporting device.
- the medium transporting device is a jetted material transporting device.
- a recording apparatus including the medium transporting device according to a further aspect of the invention is characterized by including the medium transporting device according to the invention.
- the recording apparatus taking the above each working effect.
- Fig. 1 is a side view showing a recording medium transporting device that is one of medium transporting devices according to an embodiment of the invention.
- This recording medium transporting device 100 includes a suction unit 110 which sucks and holds a recording medium at the recording time, and a recording medium transporting unit 150 which transports the recording medium from the upstream side of the suction unit 110 to the downstream.
- the suction unit 110 is arranged below a recording head 231 for recording data on the recording medium, forming a recording medium transporting path L therebetween.
- the suction unit 110 is formed in the shape of a hollow box having up-and-down two-stage structure comprising a suction part 120 of the upper stage and a suction force generating part 130 of the lower stage.
- the suction part 120 comprises a pressure reduction chamber 121 formed inside, plural suction chambers 123 which are formed on a recording medium transporting surface 122 in the shape of a rectangular recess that is long in the transporting direction of the recording medium, and plural suction holes 124 which have circular and smaller cross-section than the suction chambers 123 extending up and down so as to communicate these suction chambers 123 respectively with the pressure reduction chamber 121.
- the suction force generating part 130 is communicated with the pressure reduction chamber 121 of the suction part 120 through a communication hole 131, and includes a pump 132 having a centrifugal fan inside.
- the pump 132 is attached in the predetermined position below the pressure reduction chamber 121 in a state where it communicates with the pressure reduction chamber 121 through the communication hole 131, and the centrifugal fan turns at the recording time.
- the recording medium transporting unit 150 comprising a feed roller 151 which feeds the recording medium between the recording head 231 and the suction unit 110, a driven roller 152 which is brought into pressure-contact with this feed roller 151 from the upside, a discharge roller 153 which discharges the recording medium to the outside, and a spur roller 154 which is brought into contact with this discharge roller 153 from the upside.
- the discharge roller 153 and the spur roller 154 may not be provided.
- Figs. 2A and 2B are plan view of the suction part 120 in the first embodiment and a sectional side view taken along a line IIB-IIB of Fig. 2A .
- the suction chamber 123 is formed so that its short side has the predetermined length and its long side has the length leading from the neighborhood of an upstream end of the recording medium transporting surface 122 to the neighborhood of a downstream end. Namely, each suction chamber 123 extends in the transporting direction of the recording medium in succession, and the suction chambers 123 are arranged in the direction perpendicular to the transporting direction of the recording medium with a partition wall therebetween.
- the suction holes 124 are formed on the bottom surface of the suction chamber 123 in the transporting direction of the recording medium at the predetermined pitch. Namely, the suction holes 124 are formed for each suction chamber 123 in a row. Further, as a characteristic part of the invention, suction holes 124R and 124L formed in suction chambers 123R and 123L on which both ends of the recording medium in the direction perpendicular to the transporting direction of the recording medium, that is, both side ends of the recording medium pass are formed so that their areas become larger than those of other suction holes 124.
- the both side ends of the recording medium curled upward are sucked and attracted onto the recording medium transporting surface 122.
- This large amount of air flow is obtained by making the area of the suction hole 124 large.
- the negative pressure in the pressure reduction chamber 121 becomes small because of the following reason, so that the suction force decreases. Namely, by the gross area of the suction holes 124 and the flow rate characteristics of the pump 132, the negative pressure in the pressure reduction chamber 121 is determined.
- Fig. 3 is a diagram showing a relation among a negative pressure ⁇ P in the pressure reduction chamber 121, the gross area ⁇ S of the suction holes 124 and a flow rate Q of the pump 132, and characteristics of the negative pressure ⁇ P in the pressure reduction chamber 121 and the flow rate of the pump 132.
- the negative pressure ⁇ P in the pressure reduction chamber 121 is represented by the following expression (1) , on the basis of the gross area ⁇ S of the suction holes 124 and the flow rate Q of the pump 132.
- ⁇ P ⁇ Q / ⁇ S / 2 2
- an intersection of a graph of the expression (1) and a characteristic graph becomes the negative pressure ⁇ P in the pressure reduction chamber 121 determined by the suction holes 124 of the gross area ⁇ S at that time.
- the negative pressure in the pressure reduction chamber 121 determined when the suction holes 124 of the gross area ⁇ S1 are formed becomes ⁇ P1
- the negative pressure in the pressure reduction chamber 121 determined when the suction holes 124 of the gross area ⁇ S2 that is larger than the gross area ⁇ S1 are formed becomes ⁇ P2 that is smaller than the negative pressure ⁇ P1
- the negative pressure in the pressure reduction chamber 121 determined when the suction holes 124 of the gross area ⁇ S3 that is larger than the gross area ⁇ S2 are formed becomes ⁇ P3 that is smaller than the negative pressure ⁇ P2.
- the area ratio of the suction holes 124R and 124L formed in the portions through which both side ends of the recording medium pass to the other suction holes 124 is 2 to 6.5.
- the suction holes 124R and 124L formed in the portions through which both side ends of the recording medium pass are formed with the area ⁇ 5
- the other suction holes 124 are formed with the area ⁇ 3.5 to ⁇ 2.
- the suction opening is composed of the suction holes 124 and the suction chamber 123, and further the suction hole 124 is formed into the through-hole having the small diameter, whereby coefficient of utilization of the negative pressure which can be utilized in relation to the characteristic of the pump 132 is heightened.
- the suction chamber 123 is formed as the nearly rectangular recess that is larger in area than the suction hole 124, whereby the great suction force can be generated in relation to the recording medium.
- the suction holes are formed so that the suction holes 124R and 124L formed in the suction chambers 123R and 123L of the portions on which both side ends of the recording medium pass are larger in area than the other suction holes 124.
- the both side ends of the recording medium are kept attracted into the suction holes 124R and 124L and transported. Accordingly, since it is prevented that the both side ends of the medium are curled up unlike the related art, it is possible to prevent the stain on the medium caused by contact with the recording head 231.
- the thus constructed recording medium transporting device 100 operates as follows:
- the feed roller 151 rotates and feeds the recording medium between the recording head 231 and the suction unit 110.
- the pump 132 operates and applies the suction force through the communication hole 131 and the pressure reduction chamber 121 to the suction hole 124 and the suction chamber 123.
- the recording medium is transported in a state where it is sucked on the recording medium transporting surface 122.
- the recording head 231 moving in a main scanning direction above the recording medium, ejects an ink droplet on the recording medium to perform recording.
- the both side ends of the recording medium are kept attracted into the suction holes 124R and 124L and transported. Therefore, it is possible to prevent the recording medium from being stained by the contact with the recording head 231 caused by curling-up of the both side ends of the recording medium.
- the discharge roller 153 rotates and discharges the recording medium on which recording has been completed to the outside.
- Fig. 4 is a perspective view of an ink jet printer as a recording apparatus provided with the above recording medium transporting device 100
- Figs. 5 to 7 are a plan view, a front view, and a side view which show a main part of the ink jet printer.
- This ink jet printer 200 comprises an automatic supply feeding (ASF) unit 220 aslant attached to the backward upper portion of a printer body 210, a recording part 230 included in the printer body 210, and the recording medium transporting device 100.
- ASF automatic supply feeding
- paper for the ink jet printer 200 plain paper, an OHP film, tracing paper, and a post cart can be used.
- the ASF unit 220 comprises a tray 221 in which paper 1 is housed, and a supply roller 222 which pulls out the paper 1 from this tray 221 and supplies it.
- the recording part 230 comprises a carriage 233 on which a recording head 231 and an ink cartridge 232 are mounted, and a DC motor 235 which moves this carriage 233 along a guide shaft 234 arranged in the main scanning direction.
- the recording head 231 has a nozzle array comprising plural nozzles, for example, ninety-six nozzles for each color of cyan, magenta, yellow, light cyan, light magenta, dark yellow, and black.
- the recording medium transporting device 100 includes the suction unit 110 comprising the suction part 120 of the upper stage which sucks and holds the recording medium at the recording time and the suction force generating part 130 of the lower stage, and the recording medium transporting unit 150 which transports the recording medium from the upstream side of the suction unit 110 to the downstream.
- the suction part 120 comprises the pressure reduction chamber 121 formed inside, the plural suction chambers 123 which are formed on the recording medium transporting surface 122 in the shape of a rectangular recess that is long in the transporting direction of the recording medium, and the plural suction holes 124 which communicate these suction chambers 123 respectively with the pressure reduction chamber 121.
- suction holes 124R and 124L formed in the suction chambers 123R and 123L of the portions on the recording medium transporting surface 122 through which both ends of the recording medium in the direction perpendicular to the transporting direction of the recording medium, that is, both side ends of the recording medium pass are formed so that their areas become larger than those of the other suction holes 124.
- the recording medium transporting unit 150 includes the feed roller 151 which feeds the recording medium between the recording head 231 and the suction unit 110, and the driven roller 152 which is brought into pressure-contact with this feed roller 151 from the upside.
- This ink jet printer 200 has the suction unit 110 which can move in the discharge direction and is not provided with the discharge roller 153 which discharges the recording medium to the outside and the spur roller 154 brought into contact with the discharge roller 153 from the upside as shown in Fig. 1 .
- the ink jet printer having the discharge roller 153 and the spur roller 154 may be used.
- the thus constructed ink jet printer 200 operates as follows.
- a recording instruction on the paper 1 housed in the tray 221 is input from a not-shown host computer
- the supply roller 222 rotates and picks up the paper housed in the tray 221 one by one to supply it.
- the feed roller 152 rotates and feeds the paper 1 between the recording head 231 and the suction unit 110.
- the pump 132 operates, and applies the suction force through the communication hole 131 and the pressure reduction chamber 121 to the suction hole 124 and the suction chamber 123.
- the paper 1 is transported in the state where it is sucked on the recording medium transporting surface 122.
- the DC motor operates, and moves the carriage 233 through a timing belt along the guide shaft 234.
- the recording head 231 ejects ink of each color supplied from the ink cartridge 232 as a minute ink droplet on the paper 1 from all or a part of the plural nozzles according to recording data thereby to record the data.
- the discharge roller 153 rotates and discharges the paper 1 an which recording has been completed from a discharge outlet 201 to the outside.
- the suction chamber 123 is formed into the rectangular recess that is long in the transporting direction of the recording medium, also in case that it is formed in the shape of grid like the related art, the similar effect can be obtained. Further, also in case that a suction unit which has only the suction hole 124 without having the suction chamber 123 is used, the similar effect can be obtained.
- Figs. 8A, 8B and 8C are a plan view, a sectional side view taken along a line VIIIB-VIIIB of Fig. 8A , and a sectional side view taken along a line VIIIC-VIITC of Fig. 8A , which show a second form of the suction part.
- a suction chamber 123 is formed so that its short side has the predetermined length and its long side has the length leading from the neighbourhood of an upstream end of the recording medium transporting surface 122 to the neighbourhood of a downstream end. Namely, each suction chamber 123 extends in the transporting direction of the recording medium in succession, and in the direction perpendicular to the transporting direction of the recording medium, the suction chambers 123 are arranged with a partition wall 125 between.
- the suction hole 124 On the transportation downstream side of the recording medium, the suction hole 124 having which is larger in area is formed. Specifically, the suction holes 124 are formed so that their areas increase toward the transportation downstream side of the recording medium.
- the negative pressure in a pressure reduction chamber 121 becomes small as described above, whereby the suction force decreases. Therefore, the areas of the suction holes toward the transportation downstream of the recording medium are increased.
- the negative pressure in the pressure reduction chamber 121 can be made large. Therefore, it is possible to dynamically suck the recording medium of which leading end curls upward, and particularly the recording medium that is high in rigidity and to attract it readily.
- the suction opening is composed of the suction hole 124 and the suction chamber 123, and further the suction hole 124 is formed into the through-hole having the small diameter, whereby coefficient of utilisation of the negative pressure which can be utilized in relation to the characteristic of the pump 132 is heightened.
- the suction chamber 123 is formed as the nearly rectangular recess that is larger in area than the suction hole 124, whereby the great suction. force can be generated in relation to the recording medium.
- the areas of the suction holes 124 increase toward the transportation downstream side of the recording medium. Therefore, the leading end of the recording medium is, even in case that the recording medium advance, kept attracted into the suction holes 124 and transported. Accordingly, unlike the related art, it is possible to prevent the stain on the medium by contact with the recording head 231 caused by coming-up of the leading end of the recording medium.
- the thus constructed recording medium transporting device 100 operates as follows: Similarly to the first embodiment, the feed roller 151 rotates and feeds the recording medium between the recording head 231 and the suction unit 110. On the other hand, the pump 132 operates and applies the suction force through the communication hole 131 and the pressure reduction chamber 121 to the suction hole 124 and the suction chamber 123. Hereby, the recording medium is transported in a state where it is sucked on the recording medium transporting surface 122. Simultaneously, the recording head 231, moving in a main scanning direction above the recording medium, ejects an ink droplet on the recording medium to perform recording.
- the leading end of the recording medium is, kept attracted into the suction holes 124, transported. Therefore, it is possible to prevent the recording medium from being stained by the contact with the recording head 231 caused by coming-up of the leading end of the recording medium.
- the discharge roller 153 rotates and discharges the recording medium an which recording has been completed to the outsize.
- Fig. 9 is a plan view showing a main portion of an ink jet printer having the suction part 120 in the second form, in which the same components as those in Fig. 5 are denoted by the same reference numerals.
- the suction holes 124 are formed throughout the entire surface of the recording medium transporting surface 122 so that their areas gradually increase toward the transportation downstream side of the recording medium.
- the leading end of the recording medium kept attracted into the suction holes 124, is transported. Therefore, it is possible to prevent the recording medium from being stained by the contact with the recording head 231 caused by coming-up of the leading end of the recording medium.
- the suction chamber 123 is formed into the rectangular recess that is lang in the transporting direction of the recording medium, also in case that it is formed in the shape of grid like the related art, the similar effect can be obtained. Further, also in case that the suction unit which has only the suction hole 124 without having the suction chamber 123 is used, the similar effect can be obtained.
- Figs. 10A and 10B are a plan view and a sectional side view taken along a line XB-XB of Fig. 10A , which show the third form of the suction part 120.
- the same components as those in the first embodiment of the invention are denoted by the same reference numerals.
- escape parts 126R and 126L are formed, from which the both side ends of the recording medium can come down and be escaped.
- This escape part 126R, 126L so that the both side ends of the recording medium can come down and be escaped in the escape parts, is formed lower than the recording medium transporting surface 122. For example, it may be formed into a stepwise surface.
- the stepwise escape parts 126R and 126L are formed.
- a partition wall 125 arranged on the right side of the right-end suction chamber 123R corresponding to the right end of the recording medium is removed, and only the recess of the suction chamber 123R is intactly extended up to the right end of the recording medium transporting surface 122 thereby to form the escape part 126R.
- a partition wall 125 arranged on the left side of the left-end suction chamber 123L corresponding to the left end of the recording medium is removed, and only the recess of the suction chamber 123L is intactly extended up to the suction chamber 123 which was located'in the left neighborhood of that removed partition wall 125 thereby to form the escape part 126L.
- the both side ends PR and PL of the recording medium P after come down, are transported in that state. Therefore, unlike the related art, the both side ends PR and PL do not get on the partition walls formed outside the dimples (suction chambers) corresponding to the both side ends, and it is prevented that the both side ends PR and PL curl up by the suction force of the holes (suction holes) in the dimples corresponding to the both side ends of the recording medium, so that the stain on the recording medium due to the contact with the recording head 231 can be prevented.
- the stepwise surface is taken.
- the escape part As long as the escape part is formed lower than the recording medium transporting surface 122 so that the both side ends of the recording medium can come down and be escaped, it may be formed into any shape, for example, a slant surface.
- Fig. 11B shows escape part 127R, 127L of the slant surface, in which the partition wall 125 arranged on the right side of the right-end suction chamber 123R corresponding to the right end of the recording medium is removed, and the bottom surface of the suction chamber 123R is inclined and intactly extended up to the right end of the recording medium transporting surface 122 thereby to form the escape part 127R.
- the partition wall 125 arranged on the left side of the left-end suction chamber 123L corresponding to the left end of the recording medium is removed, and the bottom surface of the suction chamber 123L is inclined and intactly extended up to the suction chamber 123 which was located in the left neighborhood of that removed partition wall 125 thereby to form the escape part 127L.
- the both side ends of the recording medium can be more stably sucked and transported.
- the both side ends PR and PL of the recording medium P after come down, are transported in that state. Therefore, unlike the related art, the both side ends PR and PL do not get on the partition walls formed outside the dimples (suction chambers) corresponding to the both side ends, and it is prevented that the both side ends PR and PL curl up by the suction force of the holes (suction holes) in the dimples corresponding to the both side ends of the recording medium, so that the stain on the recording medium due to the contact with the recording head 231 can be further prevented. Further, as shown in Fig.
- an ink receiving part in which an ink absorber 128 such as a sponge which receives and absorbs the ejected ink droplets is embedded may be arranged at the portion of the escape part 126R, 126L.
- so-called frameless recording which makes possible recording on the whole surface of the recording medium can be performed.
- the suction opening is composed of the suction hole 124 and the suction chamber 123, and further the suction hole 124 is formed into the through-hole having the small diameter, whereby coefficient of utilization of the negative pressure which can be utilized in relation to the characteristic of the pump 132 is heightened.
- the suction chamber 123 is formed as the nearly rectangular recess that is larger in area than the suction hole 124, whereby the great suction force can be generated in relation to the recording medium.
- the both side ends of the recording medium do not curl up, so that the stain on the recording medium due to the contact with the recording head 231 can be prevented.
- Fig. 12 is a plan view showing a main portion of an ink jet printer having the suction part 120 of the third form, in which the same components as those in Fig. 5 are denoted by the same reference numerals.
- the escape parts 126R and 126L that are stepwise surface are formed, from which the both side ends of the recording medium can come down and be escaped.
- These escape parts 126R and 1261 are formed according to each of the recording medium, for example B5 size, A4 size, and B4 size by JIS, and the number of them are plural.
- the stain an the recording medium of each size by the contact with the recording head 231 can be prevented.
- the both side ends of the recording medium, after come down in the suction chambers 123R and 123L, are transported in that state. Therefore, it is possible to prevent the recording medium from being stained by the contact with the recording head 231 caused by curling-up of the both side ends of the recording medium.
- the both side ends of the recording medium after come down, are transported in that state. Therefore, unlike the related art, the both side ends of the medium do not get an the partition walls formed outside the dimples (suction chambers) corresponding to the both side ends of the recording medium, and it is prevented that the both side ends curl up by the suction force of the holes (suction holes) in the dimples corresponding to the both side ends of the recording medium, so that it is possible to bring the recording head 231 nearer to the recording medium, and recording accuracy can be further improved.
- the suction chamber 123 is formed into the rectangular recess that is long in the transporting direction of the recording medium, also in case that it is formed in the shape of grill like the related art, the similar effect can be obtained. Further, also in case that a suction unit which has only the suction hole 124 without having the suction chamber 123 is used, the similar effect can be obtained.
- the invention is applied to the recording apparatus having the recording medium transporting device.
- the invention is applied to a liquid jet apparatus having a jetted material transporting device, including, for example, an ink jet printer, the similar effect can be obtained.
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Abstract
Description
- The present invention relates to a medium transporting device which transports a medium and a recording apparatus provided with this medium transporting device.
- Heretofore, for example, in an ink jet printer that is one of recording apparatuses, while paper that is one of recording media is being fed into a recording section by a paper transporting device, recording is performed and thereafter the paper is fed out to the outside. In such the ink jet printer, while the paper is fed in a state where it is held between a feed roller and its driven roller, recording is performed in a recording head, and thereafter the paper is fed out in a state where it is held by a discharge roller and a spur roller functioning as its driver roller, and discharged.
- In the ink jet printer including such the paper transporting device, in case that an image composed of ejected many ink droplets, for example, a solid image is recorded on the paper, the paper absorbs a large amount of ink, so that it bulges toward the recording head in the wavy shape after recording, that is, cockling is produced. As this cockling develops, the distance between the paper and the recording head becomes more uneven, and unevenness is produced in ink splash distance, whereby unevenness is produced in recording, or the paper comes into contact with the recording head and stains. Therefore, recently, an ink jet printer has been proposed, in which plural openings are formed on a paper transporting surface in the paper transporting direction and in the direction perpendicular to the paper transporting direction at a regular pitch, that is, the plural openings are provided in the shape of a grid, and the paper is sucked through these opening by a suction pump thereby to suppress the above cockling (refer to
JP-A-63-303781 JP-A-3-270 - Generally, a curve (curl) is produced in paper by the influence of environment such as humidity and temperature, or by properties of surface coat material. Particularly, it is most difficult to suck and attract ends (a leading end and both side ends) of the paper which has curled upward. Therefore, there is fear that the ends of the paper which has curled are stained by contact with the recording head.
- Further, by setting a position of a feed roller arranged in a paper transportation-insertion part of the above paper transporting device, it is possible to press the leading end of the inserted paper on the paper transporting surface thereby to prevent coming-up of the leading end. However, as the paper advances, the power for pressing mechanically the leading end of the paper on the paper transporting surface is reduced, so that the leading end of the paper readily separates from the paper transporting surface. Therefore, there is fear that the leading end of the paper which has come up is stained by the contact with the recording head.
- In the ink jet printers including the above conventional suction type paper transporting device, there is an ink jet printer having a dimple around each opening in order to heighten suction force determined by negative pressure x area. However, since the dimples are formed in the shape of a grid correspondingly to each opening, both ends of the paper in a direction perpendicular to the paper transporting direction, that is, both side ends of the paper get an partition walls formed outside the dimples corresponding to the both side ends of the paper. Therefore, the both side ends of the paper readily curl up by the suction force of holes in the dimples corresponding to the both side ends, and there is fear that the both side ends are stained by contact with the recording head.
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US 2002/0167578 discloses an image forming apparatus having a paper support unit where the paper support unit has a plurality of suction holes. This document forms the basis for the preamble portion of claim 1. - An object of the invention is to prevent curling-up and coming-up of the ends of the medium when the medium is transported.
- In order to achieve the object, according to the first aspect of the invention, a medium transporting device comprising: a medium transporting surface having a plurality of suction holes an which a supplied medium is transported;
characterized in that the area of each of the suction holes formed in positions at which both side ends of said medium are transported is set larger than that of other suction holes. Hereby, since the amount of air flowing below the both side ends of the medium becomes large, the medium is transported in a state where its both side ends are attracted into the suction holes, so that it is possible to prevent the both side ends of the medium from being stained by contact with the recording head. - Further, a medium transporting device according to a preferred embodiment of the invention is characterized in that an area ratio of said suction hole having a larger area with respect to said suction hole having a smaller area is 2 to 6.5. Hereby, it is possible to make large the amount of air flowing below the both side ends of the medium without reducing the suction force.
- Further, a medium transporting device according to a preferred embodiment of the invention is characterized in that said positions on the medium transporting surface are formed in a plural number correspondingly to predetermined sizes of said medium. Hereby, it is possible to prevent the medium of each size from being stained by the contact with the recording head.
- In order to achieve the above object, a liquid jet apparatus according to a further aspect of the invention is characterized by including the medium transporting device according to the invention, wherein the medium transporting device is a jetted material transporting device.
Hereby, it is possible to provide the liquid jet apparatus taking the above each working effect. - In order to achieve the above object, a recording apparatus including the medium transporting device according to a further aspect of the invention is characterized by including the medium transporting device according to the invention. Hereby, it is possible to provide the recording apparatus taking the above each working effect.
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Fig. 1 is a side view showing a medium transporting device according to an embodiment of the invention; -
Figs. 2A is a plan view andFig 2B is a sectional side view taken along a line IIB-IIB ofFig. 2A , which show a first embodiment of a suction part inFig. 1 ; -
Fig. 3 is a diagram showing a relation among negative pressure in a pressure reduction chamber, the gross area of suction holes and flow rate of a pump, and characteristics of the negative pressure in the pressure reduction chamber and the pump flow rate; -
Fig. 4 is a perspective view showing an ink jet printer as a recording apparatus provided with the medium transporting device of the invention; -
Fig. 5 is a plan view showing a main part according to the first embodiment of the ink jet printer inFig. 4 ; -
Fig. 6 is a front view showing the main part of the ink jet printer inFig. 4 ; -
Fig. 7 is a side view showing the main part of the ink jet printer inFig. 4 ; -
Figs. 8A to 8C are a plan view, a sectional side view taken along a line VIIIB-VIIIB ofFig. 8A , and a sectional side view taken along a line VIIIC-VIIIC ofFig. 8A , which show a second form of the suction part inFig. 1 ; -
Fig. 9 is a plan view showing a main part according to the second form of the ink jet printer inFig. 4 ; -
Figs. 10A and 10B are a plan view and a sectional side view taken along a live XB-XB ofFig. 10A , which show a third form of the suction part inFig. 1 ; -
Figs. 11A to 11C are sectional views showing examples of an escape part ofFig. 10 ; and -
Fig. 12 is a plan view showing a main part according to the third form of the ink jet printer inFig. 4 . - Embodiments of the invention will be described below with reference to drawings.
-
Fig. 1 is a side view showing a recording medium transporting device that is one of medium transporting devices according to an embodiment of the invention. This recordingmedium transporting device 100 includes asuction unit 110 which sucks and holds a recording medium at the recording time, and a recordingmedium transporting unit 150 which transports the recording medium from the upstream side of thesuction unit 110 to the downstream. Thesuction unit 110 is arranged below arecording head 231 for recording data on the recording medium, forming a recording medium transporting path L therebetween. Further, thesuction unit 110 is formed in the shape of a hollow box having up-and-down two-stage structure comprising asuction part 120 of the upper stage and a suctionforce generating part 130 of the lower stage. - A first embodiment of the
suction part 120 will be described. Thesuction part 120 comprises apressure reduction chamber 121 formed inside,plural suction chambers 123 which are formed on a recordingmedium transporting surface 122 in the shape of a rectangular recess that is long in the transporting direction of the recording medium, andplural suction holes 124 which have circular and smaller cross-section than thesuction chambers 123 extending up and down so as to communicate thesesuction chambers 123 respectively with thepressure reduction chamber 121. - The suction
force generating part 130 is communicated with thepressure reduction chamber 121 of thesuction part 120 through acommunication hole 131, and includes apump 132 having a centrifugal fan inside. Thepump 132 is attached in the predetermined position below thepressure reduction chamber 121 in a state where it communicates with thepressure reduction chamber 121 through thecommunication hole 131, and the centrifugal fan turns at the recording time. - The recording
medium transporting unit 150 comprising afeed roller 151 which feeds the recording medium between therecording head 231 and thesuction unit 110, a drivenroller 152 which is brought into pressure-contact with thisfeed roller 151 from the upside, adischarge roller 153 which discharges the recording medium to the outside, and aspur roller 154 which is brought into contact with thisdischarge roller 153 from the upside. In case of the constitution in which thesuction unit 110 can be moved in the discharge direction, thedischarge roller 153 and thespur roller 154 may not be provided. -
Figs. 2A and 2B are plan view of thesuction part 120 in the first embodiment and a sectional side view taken along a line IIB-IIB ofFig. 2A . Thesuction chamber 123 is formed so that its short side has the predetermined length and its long side has the length leading from the neighborhood of an upstream end of the recordingmedium transporting surface 122 to the neighborhood of a downstream end. Namely, eachsuction chamber 123 extends in the transporting direction of the recording medium in succession, and thesuction chambers 123 are arranged in the direction perpendicular to the transporting direction of the recording medium with a partition wall therebetween. - The suction holes 124 are formed on the bottom surface of the
suction chamber 123 in the transporting direction of the recording medium at the predetermined pitch. Namely, the suction holes 124 are formed for eachsuction chamber 123 in a row. Further, as a characteristic part of the invention, suction holes 124R and 124L formed insuction chambers - Under a state where the recording medium is stuck onto the recording
medium transporting surface 122 by suction, the air flow is not produced below the recording medium. The magnitude of negative pressure (static pressure) in thepressure reduction chamber 121 is dominant over power for keeping this state (suction force in the close attachment state). On the other hand, under a state where the recording medium separates from the recordingmedium transporting surface 122, the air flow is produced below the recording medium. By dynamic pressure loss caused by air flow between the lower surface of the recording medium and the recordingmedium transporting surface 122, the recording medium is attracted on the recordingmedium transporting surface 122. - In the invention, using this latter working, the both side ends of the recording medium curled upward are sucked and attracted onto the recording
medium transporting surface 122. The larger the amount of air flowing below the recording medium is, the greater an effect is. This large amount of air flow is obtained by making the area of thesuction hole 124 large. However, in case that the areas of all the suction holes 124 are made large, the negative pressure in thepressure reduction chamber 121 becomes small because of the following reason, so that the suction force decreases. Namely, by the gross area of the suction holes 124 and the flow rate characteristics of thepump 132, the negative pressure in thepressure reduction chamber 121 is determined. -
Fig. 3 is a diagram showing a relation among a negative pressure ΔP in thepressure reduction chamber 121, the gross area ∑S of the suction holes 124 and a flow rate Q of thepump 132, and characteristics of the negative pressure ΔP in thepressure reduction chamber 121 and the flow rate of thepump 132. The negative pressure ΔP in thepressure reduction chamber 121 is represented by the following expression (1) , on the basis of the gross area ∑S of the suction holes 124 and the flow rate Q of thepump 132. - Accordingly, an intersection of a graph of the expression (1) and a characteristic graph becomes the negative pressure ΔP in the
pressure reduction chamber 121 determined by the suction holes 124 of the gross area ∑S at that time. For example, the negative pressure in thepressure reduction chamber 121 determined when the suction holes 124 of the gross area ∑S1 are formed becomes ΔP1, the negative pressure in thepressure reduction chamber 121 determined when the suction holes 124 of the gross area ∑S2 that is larger than the gross area ∑S1 are formed becomes ΔP2 that is smaller than the negative pressure ΔP1, and the negative pressure in thepressure reduction chamber 121 determined when the suction holes 124 of the gross area ∑S3 that is larger than the gross area ∑S2 are formed becomes ΔP3 that is smaller than the negative pressure ΔP2. Namely, as the gross area ∑S of the suction holes 12 increases, the negative pressure ΔP in thepressure reduction chamber 121, that is, the suction force decreases. Therefore, in this case, it is important to make larger only the suction holes 124R and 124L formed in the most necessary portions through which the both side ends of the recording medium pass than other suction holes 124. - Hereby, since the gross area of the suction holes 124 can be made small, the negative pressure in the
pressure reduction chamber 121 can be made large. Therefore, it is possible to dynamically suck the recording medium of which both side ends curl upward, and particularly the recording medium that is high in rigidity and to attract it readily. Here, it is preferable that the area ratio of the suction holes 124R and 124L formed in the portions through which both side ends of the recording medium pass to the other suction holes 124 is 2 to 6.5. For example, when the suction holes 124R and 124L formed in the portions through which both side ends of the recording medium pass are formed with the area φ5, the other suction holes 124 are formed with the area φ3.5 to φ2. - As described above, the suction opening is composed of the suction holes 124 and the
suction chamber 123, and further thesuction hole 124 is formed into the through-hole having the small diameter, whereby coefficient of utilization of the negative pressure which can be utilized in relation to the characteristic of thepump 132 is heightened. Further, thesuction chamber 123 is formed as the nearly rectangular recess that is larger in area than thesuction hole 124, whereby the great suction force can be generated in relation to the recording medium. Further, the suction holes are formed so that the suction holes 124R and 124L formed in thesuction chambers recording head 231. - The thus constructed recording
medium transporting device 100 operates as follows: Thefeed roller 151 rotates and feeds the recording medium between therecording head 231 and thesuction unit 110. On the other hand, thepump 132 operates and applies the suction force through thecommunication hole 131 and thepressure reduction chamber 121 to thesuction hole 124 and thesuction chamber 123. Hereby, the recording medium is transported in a state where it is sucked on the recordingmedium transporting surface 122. Simultaneously, therecording head 231, moving in a main scanning direction above the recording medium, ejects an ink droplet on the recording medium to perform recording. - At this time, the both side ends of the recording medium are kept attracted into the suction holes 124R and 124L and transported. Therefore, it is possible to prevent the recording medium from being stained by the contact with the
recording head 231 caused by curling-up of the both side ends of the recording medium. Next, thedischarge roller 153 rotates and discharges the recording medium on which recording has been completed to the outside. -
Fig. 4 is a perspective view of an ink jet printer as a recording apparatus provided with the above recordingmedium transporting device 100, andFigs. 5 to 7 are a plan view, a front view, and a side view which show a main part of the ink jet printer. Thisink jet printer 200 comprises an automatic supply feeding (ASF)unit 220 aslant attached to the backward upper portion of aprinter body 210, arecording part 230 included in theprinter body 210, and the recordingmedium transporting device 100. As a recording medium, paper for theink jet printer 200, plain paper, an OHP film, tracing paper, and a post cart can be used. - The
ASF unit 220 comprises atray 221 in which paper 1 is housed, and asupply roller 222 which pulls out the paper 1 from thistray 221 and supplies it. Therecording part 230 comprises acarriage 233 on which arecording head 231 and anink cartridge 232 are mounted, and aDC motor 235 which moves thiscarriage 233 along aguide shaft 234 arranged in the main scanning direction. Therecording head 231 has a nozzle array comprising plural nozzles, for example, ninety-six nozzles for each color of cyan, magenta, yellow, light cyan, light magenta, dark yellow, and black. - The recording
medium transporting device 100 includes thesuction unit 110 comprising thesuction part 120 of the upper stage which sucks and holds the recording medium at the recording time and the suctionforce generating part 130 of the lower stage, and the recordingmedium transporting unit 150 which transports the recording medium from the upstream side of thesuction unit 110 to the downstream. Thesuction part 120 comprises thepressure reduction chamber 121 formed inside, theplural suction chambers 123 which are formed on the recordingmedium transporting surface 122 in the shape of a rectangular recess that is long in the transporting direction of the recording medium, and the plural suction holes 124 which communicate thesesuction chambers 123 respectively with thepressure reduction chamber 121. - The suction holes 124R and 124L formed in the
suction chambers medium transporting surface 122 through which both ends of the recording medium in the direction perpendicular to the transporting direction of the recording medium, that is, both side ends of the recording medium pass are formed so that their areas become larger than those of the other suction holes 124. These suction holes 124R and 124L, correspondingly to each size of the recording medium, for example, B5 size, A4 size, B4 size and A3 size by JIS, are formed, and the number of them is plural. Hereby, it is possible to prevent the stain on the medium of each size caused by contact with therecording head 231. - As described foregoing, the recording
medium transporting unit 150 includes thefeed roller 151 which feeds the recording medium between therecording head 231 and thesuction unit 110, and the drivenroller 152 which is brought into pressure-contact with thisfeed roller 151 from the upside. Thisink jet printer 200 has thesuction unit 110 which can move in the discharge direction and is not provided with thedischarge roller 153 which discharges the recording medium to the outside and thespur roller 154 brought into contact with thedischarge roller 153 from the upside as shown inFig. 1 . However, the ink jet printer having thedischarge roller 153 and thespur roller 154 may be used. - The thus constructed
ink jet printer 200 operates as follows. When a recording instruction on the paper 1 housed in thetray 221 is input from a not-shown host computer, thesupply roller 222 rotates and picks up the paper housed in thetray 221 one by one to supply it. Further, thefeed roller 152 rotates and feeds the paper 1 between therecording head 231 and thesuction unit 110. - On the other hand, the
pump 132 operates, and applies the suction force through thecommunication hole 131 and thepressure reduction chamber 121 to thesuction hole 124 and thesuction chamber 123. Hereby, the paper 1 is transported in the state where it is sucked on the recordingmedium transporting surface 122. Simultaneously, the DC motor operates, and moves thecarriage 233 through a timing belt along theguide shaft 234. At this time, therecording head 231 ejects ink of each color supplied from theink cartridge 232 as a minute ink droplet on the paper 1 from all or a part of the plural nozzles according to recording data thereby to record the data. Since the both side ends of the recording medium, kept attracted into the suction holes 124R and 124L, are transported, it is possible to prevent the recording medium from being stained by the contact with therecording head 231 caused by curling-up of the both side ends of the recording medium. Next, thedischarge roller 153 rotates and discharges the paper 1 an which recording has been completed from adischarge outlet 201 to the outside. - As described above, since the both side ends of the recording medium, kept attracted into the suction holes 124R and 124L, are transported, it is possible to bring the
recording head 231 nearer to the recording medium, and recording accuracy can be further improved. In the first embodiment, though thesuction chamber 123 is formed into the rectangular recess that is long in the transporting direction of the recording medium, also in case that it is formed in the shape of grid like the related art, the similar effect can be obtained. Further, also in case that a suction unit which has only thesuction hole 124 without having thesuction chamber 123 is used, the similar effect can be obtained. - Next, a second form of the
suction part 120 will be described. -
Figs. 8A, 8B and 8C are a plan view, a sectional side view taken along a line VIIIB-VIIIB ofFig. 8A , and a sectional side view taken along a line VIIIC-VIITC ofFig. 8A , which show a second form of the suction part. The same components as those in the first embodiment of the invention are denoted by the same reference numerals. Asuction chamber 123 is formed so that its short side has the predetermined length and its long side has the length leading from the neighbourhood of an upstream end of the recordingmedium transporting surface 122 to the neighbourhood of a downstream end. Namely, eachsuction chamber 123 extends in the transporting direction of the recording medium in succession, and in the direction perpendicular to the transporting direction of the recording medium, thesuction chambers 123 are arranged with apartition wall 125 between. - On the transportation downstream side of the recording medium, the
suction hole 124 having which is larger in area is formed. Specifically, the suction holes 124 are formed so that their areas increase toward the transportation downstream side of the recording medium. - Under a state where the recording medium is stuck onto the recording
medium transporting surface 122 by suction, the air flow is not produced below the recording medium. The magnitude of negative pressure (static pressure) in thepressure reduction chamber 121 is dominant over power for keeping this state (suction force in the dose attachment state). On the other hand, under a state where the recording medium separates from the recordingmedium transporting surface 122, the air flow is produced below the recording medium. By dynamic pressure loss caused by air flow between the lower surface of the recording medium and the recordingmedium transporting surface 122, the recording medium is attracted on the recordingmedium transporting surface 122. - As described above, the larger the amount of air flowing below the recording medium is, the greater an effect is. This large amount of air flow is obtained by making the area of the
suction hole 124 large. - However, in case that the areas of all the suction holes 124 are made large, the negative pressure in a
pressure reduction chamber 121 becomes small as described above, whereby the suction force decreases. Therefore, the areas of the suction holes toward the transportation downstream of the recording medium are increased. Hereby, since the gross area of the suction holes 124 can be made small, the negative pressure in thepressure reduction chamber 121 can be made large. Therefore, it is possible to dynamically suck the recording medium of which leading end curls upward, and particularly the recording medium that is high in rigidity and to attract it readily. - As described above, the suction opening is composed of the
suction hole 124 and thesuction chamber 123, and further thesuction hole 124 is formed into the through-hole having the small diameter, whereby coefficient of utilisation of the negative pressure which can be utilized in relation to the characteristic of thepump 132 is heightened. Further, thesuction chamber 123 is formed as the nearly rectangular recess that is larger in area than thesuction hole 124, whereby the great suction. force can be generated in relation to the recording medium. Further, the areas of the suction holes 124 increase toward the transportation downstream side of the recording medium. Therefore, the leading end of the recording medium is, even in case that the recording medium advance, kept attracted into the suction holes 124 and transported. Accordingly, unlike the related art, it is possible to prevent the stain on the medium by contact with therecording head 231 caused by coming-up of the leading end of the recording medium. - The thus constructed recording
medium transporting device 100 operates as follows: Similarly to the first embodiment, thefeed roller 151 rotates and feeds the recording medium between therecording head 231 and thesuction unit 110. On the other hand, thepump 132 operates and applies the suction force through thecommunication hole 131 and thepressure reduction chamber 121 to thesuction hole 124 and thesuction chamber 123. Hereby, the recording medium is transported in a state where it is sucked on the recordingmedium transporting surface 122. Simultaneously, therecording head 231, moving in a main scanning direction above the recording medium, ejects an ink droplet on the recording medium to perform recording. - The leading end of the recording medium is, kept attracted into the suction holes 124, transported. Therefore, it is possible to prevent the recording medium from being stained by the contact with the
recording head 231 caused by coming-up of the leading end of the recording medium. Next, thedischarge roller 153 rotates and discharges the recording medium an which recording has been completed to the outsize. -
Fig. 9 is a plan view showing a main portion of an ink jet printer having thesuction part 120 in the second form, in which the same components as those inFig. 5 are denoted by the same reference numerals. The suction holes 124 are formed throughout the entire surface of the recordingmedium transporting surface 122 so that their areas gradually increase toward the transportation downstream side of the recording medium. Hereby, it is possible to prevent the recording medium of each size from being stained by the contact with therecording head 231. The leading end of the recording medium, kept attracted into the suction holes 124, is transported. Therefore, it is possible to prevent the recording medium from being stained by the contact with therecording head 231 caused by coming-up of the leading end of the recording medium. - As described above, since the leading end of the recording medium, kept attracted into the suction holes 124, is transported, it is possible to bring the
recording head 231 nearer to the recording medium, and recording accuracy can be further improved. In the second form, though thesuction chamber 123 is formed into the rectangular recess that is lang in the transporting direction of the recording medium, also in case that it is formed in the shape of grid like the related art, the similar effect can be obtained. Further, also in case that the suction unit which has only thesuction hole 124 without having thesuction chamber 123 is used, the similar effect can be obtained. - Next, a third form of the
suction part 120 will be described. -
Figs. 10A and 10B are a plan view and a sectional side view taken along a line XB-XB ofFig. 10A , which show the third form of thesuction part 120. The same components as those in the first embodiment of the invention are denoted by the same reference numerals. - At portions on the
medium transporting surface 122, on which the both ends of the recording medium in the direction perpendicular to the transporting direction of the recording medium, that is, the both side ends of the medium pass, escapeparts escape part medium transporting surface 122. For example, it may be formed into a stepwise surface. - In the example shown in
Fig. 10 , thestepwise escape parts partition wall 125 arranged on the right side of the right-end suction chamber 123R corresponding to the right end of the recording medium is removed, and only the recess of thesuction chamber 123R is intactly extended up to the right end of the recordingmedium transporting surface 122 thereby to form theescape part 126R. Further, apartition wall 125 arranged on the left side of the left-end suction chamber 123L corresponding to the left end of the recording medium is removed, and only the recess of thesuction chamber 123L is intactly extended up to thesuction chamber 123 which was located'in the left neighborhood of that removedpartition wall 125 thereby to form theescape part 126L. - Here, since the both side ends of the recording medium come down in the
escape parts escape parts suction chambers suction chambers - Hereby, as shown in
Fig. 11A , the both side ends PR and PL of the recording medium P, after come down, are transported in that state. Therefore, unlike the related art, the both side ends PR and PL do not get on the partition walls formed outside the dimples (suction chambers) corresponding to the both side ends, and it is prevented that the both side ends PR and PL curl up by the suction force of the holes (suction holes) in the dimples corresponding to the both side ends of the recording medium, so that the stain on the recording medium due to the contact with therecording head 231 can be prevented. - Further, as the example of the
escape part medium transporting surface 122 so that the both side ends of the recording medium can come down and be escaped, it may be formed into any shape, for example, a slant surface.Fig. 11B showsescape part partition wall 125 arranged on the right side of the right-end suction chamber 123R corresponding to the right end of the recording medium is removed, and the bottom surface of thesuction chamber 123R is inclined and intactly extended up to the right end of the recordingmedium transporting surface 122 thereby to form theescape part 127R. Further, thepartition wall 125 arranged on the left side of the left-end suction chamber 123L corresponding to the left end of the recording medium is removed, and the bottom surface of thesuction chamber 123L is inclined and intactly extended up to thesuction chamber 123 which was located in the left neighborhood of that removedpartition wall 125 thereby to form theescape part 127L. - Also in this case, since the both side ends of the recording medium come down in the
escape parts escape parts suction chambers suction chambers slant escape parts - Hereby, as shown in
Fig. 11B , the both side ends PR and PL of the recording medium P, after come down, are transported in that state. Therefore, unlike the related art, the both side ends PR and PL do not get on the partition walls formed outside the dimples (suction chambers) corresponding to the both side ends, and it is prevented that the both side ends PR and PL curl up by the suction force of the holes (suction holes) in the dimples corresponding to the both side ends of the recording medium, so that the stain on the recording medium due to the contact with therecording head 231 can be further prevented. Further, as shown inFig. 11C , an ink receiving part in which anink absorber 128 such as a sponge which receives and absorbs the ejected ink droplets is embedded may be arranged at the portion of theescape part - As described above, the suction opening is composed of the
suction hole 124 and thesuction chamber 123, and further thesuction hole 124 is formed into the through-hole having the small diameter, whereby coefficient of utilization of the negative pressure which can be utilized in relation to the characteristic of thepump 132 is heightened. Further, thesuction chamber 123 is formed as the nearly rectangular recess that is larger in area than thesuction hole 124, whereby the great suction force can be generated in relation to the recording medium. Further, since thepartition walls 125 arranged outside thesuction chambers escape parts suction chambers recording head 231 can be prevented. - At this time, the both side ends of the recording medium, after come down in the
suction chambers recording head 231 caused by curling-up of the both side ends of the recording medium. -
Fig. 12 is a plan view showing a main portion of an ink jet printer having thesuction part 120 of the third form, in which the same components as those inFig. 5 are denoted by the same reference numerals. At portions of the medium transporting surface, on which the both ends of the recording medium in the direction perpendicular to the transporting direction of the recording medium, that is, the both side ends of the recording medium pass, theescape parts parts 126R and 1261, are formed according to each of the recording medium, for example B5 size, A4 size, and B4 size by JIS, and the number of them are plural. Hereby, the stain an the recording medium of each size by the contact with therecording head 231 can be prevented. The both side ends of the recording medium, after come down in thesuction chambers recording head 231 caused by curling-up of the both side ends of the recording medium. - As described above, the both side ends of the recording medium, after come down, are transported in that state. Therefore, unlike the related art, the both side ends of the medium do not get an the partition walls formed outside the dimples (suction chambers) corresponding to the both side ends of the recording medium, and it is prevented that the both side ends curl up by the suction force of the holes (suction holes) in the dimples corresponding to the both side ends of the recording medium, so that it is possible to bring the
recording head 231 nearer to the recording medium, and recording accuracy can be further improved. - In the third form, though the
suction chamber 123 is formed into the rectangular recess that is long in the transporting direction of the recording medium, also in case that it is formed in the shape of grill like the related art, the similar effect can be obtained. Further, also in case that a suction unit which has only thesuction hole 124 without having thesuction chamber 123 is used, the similar effect can be obtained. - In the above first embodiment, the invention is applied to the recording apparatus having the recording medium transporting device. However, also in case that the invention is applied to a liquid jet apparatus having a jetted material transporting device, including, for example, an ink jet printer, the similar effect can be obtained.
Claims (8)
- A medium transporting device (100) for transporting a printable medium in a transporting direction comprising:a medium transporting surface (122) having a plurality of suction holes on which a supplied medium is to be transported; characterized in thatthe area of each of the suction holes (124R, 124L) formed in positions at which both ends of said medium in a direction perpendicular to the transporting direction of the medium are to be transported is set larger than the area of each of other suction holes formed on said medium transporting surface.
- The medium transporting device according to Claim 1, wherein an area ratio of said suction hole having a larger area with respect to said suction hole having a smaller area is 2 to 6.5.
- The medium transporting device according to Claim 1 or Claim 2, wherein said positions on the medium transporting surface are formed in a plural number correspondingly to predetermined sizes of said medium, for example B5 size, A4 size, B4 size and A3 size by JIS.
- The medium transporting device of any one of the preceding claims, wherein the suction holes are arranged in rows, each row comprising plural suction holes arranged in the transporting direction of the medium at a predetermined pitch.
- The medium transporting device of any one of the preceding claims, wherein the suction holes are arranged on the medium transporting surface in the transporting direction of the medium and in the direction perpendicular to the transporting direction of the medium at a regular pitch, that is, the suction holes are arranged in the shape of a grid.
- The medium transporting device according to any one of the preceding claims, comprising plural suction chambers (123) formed on the medium transporting surface, each in the shape of a rectangular recess that is long in the transporting direction of the medium, wherein the suction chambers are arranged in the direction perpendicular to the transporting direction of the medium with a partition wall therebetween and wherein plural of the suction holes are formed on the bottom surface of each suction chamber and arranged at a predetermined pitch in the transporting direction of the medium.
- A liquid jet apparatus for jetting liquid on a medium including the medium transporting device according to any one of the preceding claims for transporting the medium on which liquid is to be jetted.
- A recording apparatus including the medium transporting device according to any one of claims 1 to 6.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2003062537A JP4062733B2 (en) | 2003-03-07 | 2003-03-07 | RECORDING MEDIUM CONVEYING DEVICE AND RECORDING DEVICE |
JP2003062537 | 2003-03-07 | ||
JP2003062536 | 2003-03-07 | ||
JP2003062536A JP4462832B2 (en) | 2003-03-07 | 2003-03-07 | RECORDING MEDIUM CONVEYING DEVICE AND RECORDING DEVICE |
JP2003066079 | 2003-03-12 | ||
JP2003066079A JP4111014B2 (en) | 2003-03-12 | 2003-03-12 | RECORDING MEDIUM CONVEYING DEVICE AND RECORDING DEVICE |
Publications (3)
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EP1454757A2 EP1454757A2 (en) | 2004-09-08 |
EP1454757A3 EP1454757A3 (en) | 2004-12-15 |
EP1454757B1 true EP1454757B1 (en) | 2010-05-05 |
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Application Number | Title | Priority Date | Filing Date |
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EP04005299A Expired - Lifetime EP1454757B1 (en) | 2003-03-07 | 2004-03-05 | Medium transporting device and recording apparatus |
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US (1) | US7530687B2 (en) |
EP (1) | EP1454757B1 (en) |
CN (1) | CN100408343C (en) |
AT (1) | ATE466732T1 (en) |
DE (1) | DE602004026952D1 (en) |
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JP3662385B2 (en) * | 1997-04-18 | 2005-06-22 | オムロン株式会社 | Paper transport device |
JP4070861B2 (en) * | 1998-01-21 | 2008-04-02 | 武藤工業株式会社 | Inkjet printer |
JP3949820B2 (en) | 1998-06-26 | 2007-07-25 | 株式会社東芝 | Paper sheet transport device |
JP3469824B2 (en) * | 1999-07-16 | 2003-11-25 | シャープ株式会社 | Recording medium transport device |
JP4196503B2 (en) | 1999-12-07 | 2008-12-17 | 富士ゼロックス株式会社 | Recording device |
JP4724295B2 (en) | 2000-08-04 | 2011-07-13 | オリンパス株式会社 | Image recording device |
US6729720B2 (en) * | 1999-12-20 | 2004-05-04 | Olympus Optical Co., Ltd. | Image forming apparatus having suction holes formed in grooves of the paper supporting surface |
US6497522B2 (en) * | 2000-04-17 | 2002-12-24 | Hewlett-Packard Company | Edge lift reduction for belt type transports |
JP2001347710A (en) | 2000-06-09 | 2001-12-18 | Sharp Corp | Imaging apparatus |
JP2002137466A (en) * | 2000-08-23 | 2002-05-14 | Canon Inc | Recorder |
CN1236928C (en) * | 2001-01-10 | 2006-01-18 | 精工爱普生株式会社 | Recording device |
CN1212233C (en) * | 2001-10-17 | 2005-07-27 | 精工爱普生株式会社 | Fixed piece transporting device, liquid fixed device with the same and attractive parts |
JP4549025B2 (en) * | 2003-01-10 | 2010-09-22 | ノーリツ鋼機株式会社 | Inkjet printer |
-
2004
- 2004-03-05 DE DE602004026952T patent/DE602004026952D1/en not_active Expired - Lifetime
- 2004-03-05 EP EP04005299A patent/EP1454757B1/en not_active Expired - Lifetime
- 2004-03-05 AT AT04005299T patent/ATE466732T1/en not_active IP Right Cessation
- 2004-03-05 CN CNB2004100077480A patent/CN100408343C/en not_active Expired - Fee Related
- 2004-03-05 US US10/793,698 patent/US7530687B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE466732T1 (en) | 2010-05-15 |
US20040239741A1 (en) | 2004-12-02 |
CN100408343C (en) | 2008-08-06 |
EP1454757A3 (en) | 2004-12-15 |
DE602004026952D1 (en) | 2010-06-17 |
EP1454757A2 (en) | 2004-09-08 |
CN1526567A (en) | 2004-09-08 |
US7530687B2 (en) | 2009-05-12 |
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